Technician reported a Nose Inlet Cowl with extensive history for a Pressure Relief Door opening in flight is still in service without correct documentation or Maintenance action.

2023-02 · NASA ASRS report 1971414

Date: 2023-02 · Aircraft: B737-900 · Phase: ground

Anomalies: aircraft-equipment-problem-critical|deviation-discrepancy-procedural-far|deviation-discrepancy-procedural-published-material-policy|deviation-discrepancy-procedural-maintenance|deviation-discrepancy-procedural-mel-cdl

Synopsis

Technician reported a Nose Inlet Cowl with extensive history for a Pressure Relief Door opening in flight is still in service without correct documentation or Maintenance action.

Narrative

After the history I have seen with Aircraft X and Aircraft Y; for the T12 access /pressure relief door opening in flight; Aircraft Y was brought to my attention.If you look at the rotable parts history info; it is determined that the nose cowl that was removed from Aircraft X; #1 engine for having tons of history for the (412AR T12 pressure relief door) opening in flight; was removed; made unserviceable and sent to vendor for overhaul. Then it came back serviceable and was installed on Aircraft Y log XXXXXXX on #1 engine. Now it's having the same issue with lots of history. See logs below. So; the vendor failed to correct the issue of finding pneumatic/air leak in the unpressurized area of nose cowl.At one point the door has been taped secure; see log XXXXXXY and pictures attached to the log. This is a pressure relief door it should never be taped secure. Now it cannot do its job!!! There is no reference given in the log page to tape shut the door - no Aircraft Maintenance Manual (AMM) reference; no Engineering Order reference; no Structural Repair Manual (SRM) reference; no Flight Information Manual (FIM) reference; no nothing - just tape it shut!!!! ---- wow ----See log history below:Log XXXXXXX Log XXXXXXYLog XXXXXXZLog XXXXXXALog XXXXXXBLog XXXXXXC - latch r/rLog XXXXXXD - PAX reportLog XXXXXXE - PAX reportLog XXXXXXF - taped shut Log XXXXXXG - log with conflicting info -- see below - latch r/rLog XXXXXXH - log - latch r/rThe log XXXXXXG was created for #2 ENG due to history for panel 412AR. This is wrong. Panel 412AR is on #1 engine and not on #2 engine. Must be a typo error. The history is on #1 engine. The whole log page has conflicting information.Please note that this Aircraft Y is currently flying around with a faulty/ bad nose cowl on #1 engine.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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